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United States Department of Agriculture

Agricultural Research Service

Research Project: Assessing Resistance in National Small Grains Collection (NSGC) Accessions to Emerging Wheat Diseases

Location: Small Grains and Potato Germplasm Research

2011 Annual Report


1a.Objectives (from AD-416)
The objective of this work is to assess disease resistance in wheat accessions from the National Small Grains Collection to diseases of increasing importance in U.S. wheat production.


1b.Approach (from AD-416)
Key accessions from the NSGC are being genotyped using DArT marker technology and SSR markers. These materials will be tested at North Dakota State University for resistance to important wheat diseases including bacterial leaf streak, Stagonospora nodorum blotch, tan spot, and Septoria tritici blotch. An association genetics approach will be taken to search for relationships between markers and disease resistance. Disease resistance data will be reported to the Germplasm Resources Information Network for dissemination to the plant breeding community.


3.Progress Report

Using a set of accessions from the National Small Grains Collection, we discovered novel loci for resistance to an important disease of wheat called Stagonospora nodorum blotch. The discovery was made using an ‘association mapping’ method, where the presence of molecular markers is associated with the disease resistance trait in a genetically diverse host population. The novel resistance found in the study could be useful in wheat breeding for control of the disease in the US. This result contributes to the objective 2 by strategically evaluating accessions from the collection for resistance to important diseases.

Activity in the project was monitored via conference calls and email.


Last Modified: 7/30/2014
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